August 2007

29.08.2007
Second quarter 2007 financial results announcement and conference call

The management of Mobile TeleSystems (MTS) will be holding a conference call to discuss the Company’s Second Quarter 2007 Financial and Operating Results on Tuesday, September 4, 2007.

17.08.2007
MTS Announces Subscriber Growth Numbers for July 2007

Moscow, Russian Federation — Mobile TeleSystems OJSC («MTS» — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 74.99 million users on July 31, 2007.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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